Method for recognizing the power stroke of a four-stroke engine

US5402675A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Robert Entenmann · Memmingen, DE
• Siegfried Rohde · Schwieberdingen, DE
• Bernhard Stengel · Tamm, DE
• Stefan Unland · Schwieberdingen, DE
• Matthias Philipp · Stuttgart, DE
• Oskar Torno · Schwieberdingen, DE
• Ulrich Rothhaar · Milano, IT

Key dates

• Filing date: Oct 6, 1993
• Grant date: Apr 4, 1995
• Expiry date: Oct 6, 2013

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method for recognizing a power stroke of each cylinder in a four-stroke engine calls for sensing a parameter of a cylinder in the engine for producing a signal of the parameter, the parameter being selected from the group consisting of pressure and knocking, and comparing the signal with a threshold value for determining whether the signal exceeds the threshold value and thereby is indicative of the cylinder being in a corresponding combustion stroke. In addition to sensing the pressure and knocking of the cylinder, sensing of sound signals from the cylinder is also employed in order to determine power and intake strokes of the cylinders.